DNA Paternity Testing From DNA Diagnostics Center. DDC is one of the largest DNA testing companies in the world. Founded in 1995, DDC offers comprehensive DNA testing services for paternity and other family relationships. DDC performs over 600,000 DNA tests annually.
Here are some examples of heat energy. 1  The biggest example of heat energy in our solar system is the sun itself. 2  The sun radiates heat to warm us up one the planet earth. 3  When the burner of a stovetop is very hot, it is a source of heat energy.
Geothermal energy is called a renewable energy source because the water is replenished by rainfall, and the heat is continuously produced by the earth. 2. History of Geothermal Energy. Many ancient peoples, including the Romans, Chinese, and Native Americans, used hot mineral springs for bathing, cooking, and heating.